A:Answer The microwave fan in the SMH9187 is designed to run automatically to cool the internal components, and it is not unusual for it to turn on as needed, particularly if the cooktop or oven under the microwave are being used. If yours is running continuously for no apparent reason, however, I would suggest calling 888-BEST BUY or 800-SAMSUNG to speak with an agent who will be happy to assist you.
- Ms. Samsung